Ground Water Susceptibility	* Systems That Pose an Imminent Health Threat	Cesspool, Drywell, Leaching Pit, Seepage Pit, or Other Pit	* * Less Than the Required Vertical Separation
Areas That Are Highly Susceptible to Ground Water Contamination	10 Months	10 Months	3 Years
Areas That Are Moderately Susceptible to Ground Water Contamination	10 Months	3 Years	5 Years
Areas That Have Low Susceptibility to Ground Water Contamination	10 Months	5 Years	10 Years

Notes
* A system that poses an imminent health threat is a system that discharges untreated sewage to the soil surface, surface waters, field tile, or into the interior of a building.

* * Vertical separation is the distance of sand or soil between the bottom of the distribution medium (usually drainfield rock) and the top layer of seasonally saturated soil or bedrock. At least three feet of vertical separation is required for systems installed after April 1, 1996, and for those systems located in a Shoreland or Wellhead Protection Area or serving a Food, Beverage or Lodging Establishment. Any other system is required to have at least two feet of vertical separation. See Minnesota Rules part 7080.1500, subpart 4D and 4E for more information.